- Professor G Modi, Division of Neurology, Department of Neurosciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, PO Box 909, Lenasia, 1820, South Africa;
- Received October 14, 2006
- Revised December 30, 2006
- Accepted January 3, 2007
- First published January 12, 2007.
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